espace de twisteurs réduit Z par conséquent est une sous-variété, qu'il faudra précisement décrire En outre, on fait place à une observation de Berard-Bergery, Ochiai [%]. D'une importance cruciale dans la théorie des twisteurs en dimension 4 est la correspondance établie en [!] entre les brés holomorphes de l'espace de twisteurs, holomorphiquement triviaux sur chaque bre, et certains brés appelés auto-duaux sur la base. Cela appelle une généralisation si possible, en suivant Slupinski [#] dans le cas riemannien. Enn, une particularité de S 6 parmi les variétés SNK de dimension 6 est qu'elle admet plusieurs structures presque complexes J compatibles avec une métrique donnée g telles que (S 6 , g, J) est NK ,
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